【作者】 高筠； 王岭； 周正； 戴磊； 毛磊；

【Author】 GAO Yun,ZHOU Zheng,WANG Ling,DAI Lei,MAO Lei (College of Chemical Engineering and Biological Technology,Hebei Polytechnic University,Tangshan,Hebei 063009,China)

【机构】 河北理工大学化工与生物技术学院；

【摘要】 采用FFC剑桥工艺以NiO粉末或NiO-La₂O₃（Ni:La=5:1）粉末为原料经一步熔盐电解成功制备了金属Ni和LaNi₅合金.将模压成型的NiO或NiO-La₂O₃片烧结后作为阴极,高密度石墨棒作为阳极,在CaCl₂-NaCl混合熔盐中进行电解.研究了成型压力、烧结温度、槽电压和电解时间等对制备LaNi₅合金的影响.得到熔盐电解制备LaNi₅的适宜条件为NiO-La₂O₃粉末在30 MPa下模压成型,850℃烧结5h后,在850℃的CaCl₂-NaCl熔盐中,3.1V槽电压下电解36h.探讨了制备LaNi₅的反应机理.估算在适宜的工艺条件下电解NiO-La₂O₃制备LaNi₅的电流效率为7.65%,电能消耗为26678.1 kW·h/t-LaNi₅.更多还原

【Abstract】 FFC Cambridge process which has a short route,low energy consumption and without environmental influence is proposed for preparation of LaNi₅ powders by direct electrolytic deoxidization of NiO and La₂O₃（Ni:La=5:l）.NiO and La₂O₃ powders are compacted into pellets,sintered and used as cathode.High-density graphite is used as anode.The influences of compacting pressure, sintering temperature,cell voltage and electrolytic time on preparation of LaNi₅ from NiO-La₂O₃ are studied.The results show that the optimal conditions are obtained:NiO-La₂O₃ pellets are compacted at 30 MPa,when sintered at 850℃for 5 h and electrolyzed under 3.1 V in CaCl₂-NaCl at 850℃for 36 h.Charge-discharge performances of products prepared under the optimal conditions are investigated. The mechanism on preparation of LaNi₅ is discussed.Current efficiency is 7.65%and energy consumption 26678.1 kW·h/t-LaNi₅ for preparation of LaNi₅ from NiO-La₂O₃ under the optimal conditions.更多还原